| Year | Value | | 2022 | 6,134 | | 2021 | 6,102 | | 2020 | 6,080 | | 2019 | 6,071 | | 2018 | 6,080 | | 2017 | 6,103 | | 2016 | 6,135 | | 2015 | 6,153 | | 2014 | 6,141 | | 2013 | 6,086 | | 2012 | 5,990 | | 2011 | 5,851 | | 2010 | 5,667 | | 2009 | 5,448 | | 2008 | 5,221 | | 2007 | 4,985 | | 2006 | 4,725 | | 2005 | 4,454 | | 2004 | 4,177 | | 2003 | 3,912 | | 2002 | 3,688 | | 2001 | 3,519 | | 2000 | 3,378 | | 1999 | 3,245 | | 1998 | 3,137 | | 1997 | 3,063 | | 1996 | 2,994 | | 1995 | 2,899 | | 1994 | 2,780 | | 1993 | 2,653 | | 1992 | 2,526 | | 1991 | 2,408 | | 1990 | 2,300 | | 1989 | 2,195 | | 1988 | 2,094 | | 1987 | 2,000 | | 1986 | 1,913 | | 1985 | 1,832 | | 1984 | 1,759 | | 1983 | 1,695 | | 1982 | 1,639 | | 1981 | 1,595 | | 1980 | 1,570 | | 1979 | 1,561 | | 1978 | 1,564 | | 1977 | 1,577 | | 1976 | 1,595 | | 1975 | 1,615 | | 1974 | 1,635 | | 1973 | 1,657 | | 1972 | 1,678 | | 1971 | 1,694 | | 1970 | 1,707 | | 1969 | 1,720 | | 1968 | 1,733 | | 1967 | 1,745 | | 1966 | 1,752 | | 1965 | 1,753 | | 1964 | 1,751 | | 1963 | 1,745 | | 1962 | 1,738 | | 1961 | 1,726 | | 1960 | 1,708 |
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